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Giant Decrease in Interfacial Energy of Liquid Metals by Native Oxides.

Woojin Jung1, Man Hou Vong2, Kiyoon Kwon1

  • 1School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon, 16419, South Korea.

Advanced Materials (Deerfield Beach, Fla.)
|October 10, 2024
PubMed
Summary
This summary is machine-generated.

Native oxides on liquid metals act as highly effective surfactants, dramatically reducing interfacial tension. This natural phenomenon explains metal adhesion and enables unique fluid behaviors for applications like thin film deposition.

Keywords:
Eutectic Galluim‐Indium (EGaIn)galinstangalliuminterfacial energyliquid metal (LM)

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Fluid Dynamics

Background:

  • Native oxides commonly form on metal surfaces.
  • The interfacial properties of liquid metals with their native oxides are not well understood.
  • Conventional surfactants are used to modify interfacial tension but require external addition.

Purpose of the Study:

  • To investigate the effect of native oxides on the interfacial tension of liquid metal alloys.
  • To understand the surfactant-like behavior of native oxides.
  • To explore the implications of low interfacial energy for liquid metal structures and phenomena.

Main Methods:

  • Johnson-Kendall-Roberts (JKR) measurements were performed on gallium-based liquid metal alloys.
  • Characterization of oxide composition and interfacial properties.
  • Analysis of fluid instabilities and structure formation.

Main Results:

  • Native oxides significantly reduce metal-oxide interfacial tension (from 724 to 10 mN m-1).
  • Oxides exhibit surfactant-like asymmetry, being more effective than conventional surfactants.
  • Low interfacial energy stabilizes non-spherical liquid metal shapes.
  • Fluid instabilities driven by oxide tension enable oxide-encased bubble formation and thin film deposition (1-5 nm).

Conclusions:

  • Native oxides function as highly efficient, naturally occurring surfactants for liquid metals.
  • The surfactant properties of oxides explain metal adhesion and enable novel applications.
  • This research has broad implications for various metals and metal oxides, impacting materials science and fluid dynamics.